Compound packing for engines or pumps.



m s47,|94. Patented Apr. I0, 1900. m. MASON.

GO MPOUND PACKING FO R ENGINES 0R PUMPS.

(Application filed Dec. 1?, 1896. Renewed Feb. 16, 1900,)

(No Model.)

ma "cams Perms cu, womurnu, WASNINGTON. u. c.

llniirnn STATES prion,

PArnNr MATTI-IElV MASON, OF NEWV YORK, N. Y., ASSIGNOR, BY DIRECT ANDMESNE ASSIGNMENTS, TO THE MARINE RUBBER COMPANY, OF SAME PLACE.

COMPOUND PACKING FOR ENGINES OR PUMPS.

SPECIFICATION forming part of Letters Patent No. 647,194, dated. April10, 1900. Application filed December 17, 1896. Renewed February 16,1900- Serial No. 5,542. (No model.)

To all whom it may concern:

Be it known that I, MATTHEW MASON, of the city of New York, (Brooklyn,)in the county of Kings and State of New York, have invented a new anduseful Improvement in Compound Packings for Engines or Pumps, of whichthe following is a specification.

The compound packing which is the subject of this invention isapplicable to the various parts of engines and pumps in which packing isnecessary, but especially to the stuffingboxes of piston and valve rods,and it has special advantages for the piston-rods and valve-rods ofsteam-engines, the packing for which is necessarily exposed to hightemperatures. The said packing is composed of asbestos, cotton-duck, orother woven vegetable fiber and india-rubber so arranged together andcombined in a strip, as hereinafter described, as to utilize mostadvantageously for the constitution of an effective and durable packingthe peculiar properties of each of said substances or fabrics, all ofwhich have been used in various other ways in packing.

Figure 1 represents a longitudinal View, partlyin section, of a piece ofcompound packing-strip embodying my invention; Fig. 2, a transversesection of the same.

A designates a strip of india-rubber, preferably vulcanized; B, a stripof asbestos fabric, preferably braided; C, a strip composed of severalthicknesses of cotton-duck united by the interposition between them ofindiarubber. The india-rubber A is of a depth equal to the whole depthand of a width equal to half (more or less) of the Width of the compoundstrip. The strips of asbestos B and cotton-duck C are each of a widthabout equal to half that of the compound strip and are each of a depthabout equal to half the depth of the rubber strip A, so that the saidstrip A laps both of the stripsB C. The three strips A B 0 thus arrangedare united by any suitable cement, as india-rubber, and are furthersecured together by a strip E, of cloth or wire-gauze, which envelopsthem on three sides, leaving exposed the fourth side or face, which ispartly composed of the asbestos strip B and the strip 0 of cotton-duck.A lubri- 5o cant consisting of graphite or other suitable substance maybe applied to the strip in any suitable manner.

The compound packing-strip thus composed is placed in a stuffing-box inseveral layers, with the exposed portions of the asbestos andcotton-duck next the piston-rod, so that the asbestos and thecotton-duck constitute the face or wearing-surfaces, while the rubberforms the back. When the packing is thus placed, the compression towhich it is subject by the gland or follower comes directly upon therubber, the asbestos, and the cotton-duck. The rubber, owing to itssuperior elasticity, forms a cushion-back and obviates the need of suchexcessive compression as to injuriously indurate the asbestos. Theasbestos serves as the principal agent for holding the lubricant, whilethe cotton-duck and the rubber serve to retain the asbestos in place,the

cotton-duck also serving to protect the asbestos against thedisintegration to which it is subject in steam-packing by water ofcondensation.

What I claim as my invention is- A compound packing-strip the face ofwhich is composed in part of a strip of asbestos fabric and in part of astrip consisting of several layers of woven vegetable fibrous fabric,and the back of which is composed of a strip of 8c india-rubber lappingboth said strips of the face, substantially as herein described.

MATTHEW MASON. Witnesses:

FREDK. HAYNES, EDWARD VIESER.

